> ## Documentation Index
> Fetch the complete documentation index at: https://docs.artbucket.io/llms.txt
> Use this file to discover all available pages before exploring further.

# A signed URL to an asset

> Asset bytes are private: /a/{id} serves people who can see the asset. A signed URL lets anyone who holds it in until it expires, originals, renditions and downloads alike, while the asset may be used. Takes share on it; only an approved, unexpired asset out of embargo. To serve it to anyone for good, PATCH it `public: true` instead.

Scope: `write`.



## OpenAPI

````yaml /openapi.json post /api/v1/assets/{id}/signed-url
openapi: 3.1.0
info:
  title: artbucket
  version: '1'
  description: >-
    Agent-first asset management. The web UI is built on this API and nothing
    else, beside signing in at /api/auth. Send `Authorization: Bearer <key>`: a
    key works in one workspace with one scope, and scopes are a ladder: read <
    propose < write < admin. People signed in to the app carry a session cookie
    instead, and their scope is what their grants add up to: on the
    organization, the workspace, or single collections and assets. A scope shown
    as needed on the workspace is also enough on the one collection or asset a
    route acts on. Agents (MCP at POST /api/v1/mcp) usually get `propose`: what
    they add waits for a human.
servers:
  - url: http://localhost:3000
security:
  - bearer: []
  - session: []
  - {}
paths:
  /api/v1/assets/{id}/signed-url:
    parameters:
      - name: id
        in: path
        required: true
        description: Asset id
        schema:
          type: string
    post:
      summary: A signed URL to an asset
      description: >-
        Asset bytes are private: /a/{id} serves people who can see the asset. A
        signed URL lets anyone who holds it in until it expires, originals,
        renditions and downloads alike, while the asset may be used. Takes share
        on it; only an approved, unexpired asset out of embargo. To serve it to
        anyone for good, PATCH it `public: true` instead.


        Scope: `write`.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: object
              properties:
                expiresIn:
                  default: 604800
                  description: >-
                    Seconds it works for: a minute to a year, a week when left
                    out
                  type: integer
                  minimum: 60
                  maximum: 31536000
              additionalProperties: false
      responses:
        '200':
          description: The URL
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: object
                    properties:
                      url:
                        type: string
                        format: uri
                        description: >-
                          The original; add a rendition before the query,
                          /a/{id}/w_800,f_webp?s=..., or ?download
                      expiresAt:
                        type: string
                        format: date-time
                        pattern: >-
                          ^(?:(?:\d\d[2468][048]|\d\d[13579][26]|\d\d0[48]|[02468][048]00|[13579][26]00)-02-29|\d{4}-(?:(?:0[13578]|1[02])-(?:0[1-9]|[12]\d|3[01])|(?:0[469]|11)-(?:0[1-9]|[12]\d|30)|(?:02)-(?:0[1-9]|1\d|2[0-8])))T(?:(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d(?:\.\d+)?(?:Z|([+-](?:[01]\d|2[0-3]):[0-5]\d)))$
                    required:
                      - url
                      - expiresAt
                    additionalProperties: false
                required:
                  - data
                additionalProperties: false
        default:
          description: An error
          content:
            application/json:
              schema:
                type: object
                properties:
                  error:
                    type: object
                    properties:
                      code:
                        type: string
                      message:
                        type: string
                      detail: {}
                    required:
                      - code
                      - message
                    additionalProperties: false
                required:
                  - error
                additionalProperties: false
components:
  securitySchemes:
    bearer:
      type: http
      scheme: bearer
      description: 'An API key: ab_...'
    session:
      type: apiKey
      in: cookie
      name: better-auth.session_token
      description: Signed in, at /api/auth

````